Avoid matching $pdb in find_glob_dirs()
Avoid matching $pdb in find_glob_dirs()

This bug doesn't relate to pkgng, but it's useful to fix it to allow
for parallel testing.

Open343/pkg,junovitch/pkg,Open343/pkg,khorben/pkg,skoef/pkg,skoef/pkg,en90/pkg,khorben/pkg,junovitch/pkg,khorben/pkg,en90/pkg